"Fluttering" sound... is it normal? Vid inside
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This is a discussion on "Fluttering" sound... is it normal? Vid inside within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Ever since I installed a full turbo-back exhaust system, I get a pretty loud "fluttering" noise from my engine bay ...

  1. #1
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    "Fluttering" sound... is it normal? Vid inside

    Ever since I installed a full turbo-back exhaust system, I get a pretty loud "fluttering" noise from my engine bay area. I believe its the turbo and it only happens as it tries to spool. Once its spooled and boosting I can't really hear it. Is this normal? I checked for exhaust leaks and didn't find anything.

    Here are my mods:

    - 4" downpipe to 3" exhaust
    - Cobb accessport stage 2 protuned

    Click here to see the video of it:

    Flutter - Video

    2006 WRX MT - VF39 with mail ordered protune - Speedo vid
    2003 Mustang Cobra - Your basic bolt-ons - Speedo vid
    1983 Firebird - Built motor with T-56

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  3. #2
    Registered User Timdog1650's Avatar
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    Do a search for "Wastegate Flutter." It's totally normal.

    Could also be the characteristic "boxer rumble." It might also be a post-turbo exhaust leak, although I doubt it. Your car sounds pretty normal for having a huge 4" downpipe...

  4. #3
    Registered User justin.jordan2's Avatar
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    i love that sound, i want it. boohoo i love when supra's have that sound, its awesome. bad for waste gate though all that slapping around..
    COBB FLASHED STAGE 2, UPPIPE, DOWNPIPE WITH HIGH FLOW CAT, AND FULL 3 INCH CAT BACK, 160 CRUCIAL RACING THERMOSTAT, K&N FILTER. TRACK: 1/4 MILE 13.66 102.7 MPH ON THE COBB OTS MAP

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    Registered User Timdog1650's Avatar
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    Quote Originally Posted by justin.jordan2 View Post
    bad for waste gate though all that slapping around..
    No it's not. Won't do anything at all. No need to worry about it. It can be remedied by tightening the wastegate arm, but I wouldn't recommend that unless you really know exactly what you're doing.

  6. #5
    Registered User teflon_jones's Avatar
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    Quote Originally Posted by Timdog1650 View Post
    No it's not. Won't do anything at all. No need to worry about it. It can be remedied by tightening the wastegate arm, but I wouldn't recommend that unless you really know exactly what you're doing.
    +1 million
    Scott
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
    '13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
    '04 Porsche 911 Turbo GT2 clone 600 HP/TQ
    '77 F-150 heavily modded for off-roading

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